SetNeedsRedraw directly when updating a visible tile.

cc/resources/tile.h

Index: cc/resources/tile.h
diff --git a/cc/resources/tile.h b/cc/resources/tile.h
index c6413677eb9cff8a8d506c80722705060ddd904e..230952aa5837d25034ee84f794e342cf50c052a4 100644
--- a/cc/resources/tile.h
+++ b/cc/resources/tile.h
@@ -66,6 +66,10 @@ class CC_EXPORT Tile : public RefCountedManaged<Tile> {
   void set_shared(bool is_shared) { is_shared_ = is_shared; }
   bool is_shared() const { return is_shared_; }
 
+  bool is_active_and_visible_priority() const {
+    return priority(ACTIVE_TREE).distance_to_visible == 0.f;
+  }
+
   bool is_occluded_for_tree_priority(TreePriority tree_priority) const {
     switch (tree_priority) {
       case SMOOTHNESS_TAKES_PRIORITY: